2 sets of 18" rears would give you 9" width all around. 9" is the stock sport front wheel size, and an aftermarket 10" wheel fits up front pretty easily as well.
The only issue you have to look at is offset, but I think the offset difference may work in your favor in the case of mounting a rear wheel on the front, giving you a more flush look, the equivalent of using a 15mm spacer. In the rear you may have to use a 15mm spacer to re-square the stance.
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